- A
VPC Gateway Endpoint
Why wrong: Gateway endpoints support S3 and DynamoDB only, not general internet access.
- B
Internet Gateway
Why wrong: Internet Gateway allows inbound traffic; not suitable for private subnets.
- C
NAT Gateway
Why wrong: NAT Gateway does not support IPv6.
- D
Egress-Only Internet Gateway
Egress-only internet gateway provides outbound-only IPv6 access.
Question 500 of 1,705
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company has a VPC with an IPv6 CIDR and wants to provide internet access to instances in a private subnet using IPv6. Which AWS service should be used?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Egress-Only Internet Gateway
An Egress-Only Internet Gateway (EIGW) is the correct AWS service for providing outbound-only IPv6 internet access to instances in a private subnet. Unlike IPv4, IPv6 addresses are globally unique and publicly routable by default, so a NAT-like translation is unnecessary; the EIGW allows outbound traffic while preventing unsolicited inbound connections, aligning with the private subnet's security posture.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
VPC Gateway Endpoint
Why it's wrong here
Gateway endpoints support S3 and DynamoDB only, not general internet access.
- ✗
Internet Gateway
Why it's wrong here
Internet Gateway allows inbound traffic; not suitable for private subnets.
- ✗
NAT Gateway
- ✓
Egress-Only Internet Gateway
Why this is correct
Egress-only internet gateway provides outbound-only IPv6 access.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the Egress-Only Internet Gateway with a NAT Gateway, mistakenly thinking IPv6 requires address translation, or they select the Internet Gateway without realizing it would expose private instances to inbound IPv6 traffic.
Detailed technical explanation
How to think about this question
Under the hood, the EIGW is a horizontally scaled, redundant component that uses a stateful firewall model: it tracks outbound flows and only permits return traffic for those flows. It operates at layer 3, forwarding IPv6 packets to the internet via the VPC's route table (destination ::/0 pointing to the EIGW ID). In a real-world scenario, if an EC2 instance in a private subnet needs to download patches from an IPv6-enabled repository, the EIGW ensures the traffic egresses while blocking any unsolicited inbound IPv6 connections, such as SSH attempts from external hosts.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Egress-Only Internet Gateway — An Egress-Only Internet Gateway (EIGW) is the correct AWS service for providing outbound-only IPv6 internet access to instances in a private subnet. Unlike IPv4, IPv6 addresses are globally unique and publicly routable by default, so a NAT-like translation is unnecessary; the EIGW allows outbound traffic while preventing unsolicited inbound connections, aligning with the private subnet's security posture.
What should I do if I get this ANS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
This ANS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ANS-C01 exam.
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